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FWT’s gas filling system is an accessory for the various LET counters and Ionization Chambers presently available. Its principal purpose is to serve as an interface between a mechanical vacuum pump, a supply of tissue- equivalent gas, and the LET counter.

The gas filling system is composed of:

1) an accurate mechanical vacuum gauge with a range from 0 to 5 cm, 0 to 10 cm, or 0 to 20 cm Hg; 2) connections to allow attachment of a mechanical vacuum pump and a supply of tissue equivalent gas

3) bellows sealed valves with Teflon® seats to control the vacuum and gas inlets and to serve as a protection device for the gauge; and

High Quality Mechanical Gauge

Use to Fill All FWT detectors

Helium Leak Tested

Insures User of Proper Gas Fill

No Switching of Gas Lines Necessary

Easy to Use
4) a connector to allow attachment of the LET counter. The parts are assembled on a rigid aluminum plate with deep engravings showing the vacuum piping and component function.

The system has been assembled with extreme care so that contamination is at a minimum. Individual components and the assembled complete system have been helium leak tested to insure leak-free performance.

Valves: Bellows type, Teflon® seats for positive shutoff
Gas Inlet Connector: Mates with Swagelok® B-QC4-D-400
Counter Inlet Connector: Mates with Swagelok® B-QC4-D-400
Vacuum Pump Connector: Pipe suitable for clamping 1/2-in. to 3/4-in. I.D. vacuum hose
Vacuum Pump Requirements: Mechanical pump, 30 liters per minute, 5 x 10-5 mm Hg ultimate
Vacuum Gauge: Aneroid type, 0 to 10 cm Hg standard, 6-inch dial, accuracy <±0.012 cm Hg
Leakage: Individual parts and complete system helium leak checked, leak rate <2x10-5 std cc/sec
Dimensions: 16 in. (40.5 cm) long, 13 in. (33 cm) wide, and 10 in. (25 cm) high
Weight: 19 lb. (8.6 kg) with cover

Ordering Information

GFS-1: Gas Filling System with cover

Various modifications of the system are possible, such as vacuum gauges of different ranges (0 to 10 cm Hg standard), additional valves and connectors, rack mounting, etc. Please contact FWT for additional information.

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Specifications subject to change without notice.
Far West Technology, Inc. © 2003 Fax: +1.805.964.3162 Tel: +1.805.964.3615 Email: [email protected]